Favorite?
Mo Smith. Class, heart, skill, athleticism...the guy has it all. If he were younger, he'd probably still be undefeated. Like Renzo, takes his losses like a man.
Close second, Mo's training partner Frank Shamrock. Probably the best pound-for-pound fighter in the world when he's active. I do wish he would shut up occasionally though.
I have a lot of respect for Sak, Renzo, and Oleg as well.